SPEC Presents Dr. Andre Veltman
October 11, 2005
Thursday, October 13, 2005 at 3:00 PM
Monteith, Room 136 (Auditorium)
SPEAKER: Dr. Andre Veltman
André Veltman was born in the Netherlands in 1964. He received his electrical engineering degree and his Ph.D. degree in 1989 and 1994 at Twente University and Delft University of Technology respectively, both in the Netherlands. He was a teaching assistant in Africa at the University of Zambia, in Lusaka during 1986-1987. From 1994 till 1997 he worked, under a fellowship from the Royal Dutch Academy of Arts and Sciences in Amsterdam, as a post-doc at Eindhoven University of Technology, the Netherlands. The first of these three years he spent as a visiting post-doc fellow at the University of Wisconsin, Madison, USA, working on flux-based inverter control. In 1997 he founded the design company ‘Piak Electronic Design’ for drive and control systems ranging from Watts till MegaWatts. Part-time engagement as an assistant professor with Eindhoven University of technology is withstanding. He is the author of more than 5 patents on various subjects such as class-D amplifier control, efficient 3-phase current control, parallelling induction motors, sensorless control of linear PM machines, low cost induction motor controllers, and an acoustic estimator of gas-bottle contents.
His main fields of interest are: power electronics, class-D amplifiers, frequency inverter control using `The Fish Method', on-line parameter estimation, high performance drives, hybrid vehicles, sensorless control and microcontroller based systems.
TOPIC: Control of a 2.4MW Linear Synchronous Motor for launching roller-coasters
ABSTRACT: To accelerate a heavy roller-coaster train to a speed of 25m/s in less than 3 seconds requires a lot of thrust. A 2.4MW Linear Synchronous Motor is applied for this function. Optimal thrust implies optimal current control. Because of the increasing velocity along the track, the stator configuration changes continuously during a launch (sequentially switched stator). A strategy to control 3kA of current during abrupt changes in stator inductance, while maintaining thrust, is presented.